Can 15 minus 20 be done?

Should a semi colon come after parentheses? If the price of carpet is 4.92 a square yard how much is a 12 foot by 20 foot carpet going to cost? What is the area of a triangular pyramid if each face has an area of 30mm2? How much is 82000.00 miles in km? Is 5 feet greater than 60 inches or the same and why? What is the answer to 30 plus 0 plus 60 plus2 plus 4 plus 2 minus two? How do you distribute? How do you use the distributive property with numerical expressions? What does the acronym RISE stand for? What is one and one third subtract two thirds? What was the radius of the circular area An earthquake was felt throughout a circular area of 1808.64 square miles? How many internet users are there in the world? Why is the water bond angle 104.5 less than the CH4 bond angle 109.5? 20 percent of 100? When you are in six grade do you have to stay in six grade or in seven grade? What is 0.000723 in scientific notation? What are the disadvantages of fetal genetic testing? How many hours of recording on8gb microsd card? How many nurses die per year? What is 20percent of 60.00 dollars?